Global Post: When Brazilian presidential candidate Eduardo Campos' plane went down near Sao Paulo this month, one of the most improbable consequences may have been to thrust the Amazon center stage in the race. Yet that's what is happening now that Campos' running mate, environmentalist Marina Silva, has taken his place on the ballot for the October vote. Silva, who learned to read and write only at age 16 after growing up in poverty on a remote jungle plantation, has a certain appeal with disgruntled voters....